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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730e2b4a5da7a849e0a18418147dd15ba240228263b16f924c64b765b85c7f30' 
  AND token = 'jaIxbb/pff18GCW6v5SmskLcKJtz8i0xyOq8V2L1Krg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}