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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c3f8e1e74d3333aeacdb28e08098531b26d945b4c739facf00b6c76dedaf3c' 
  AND token = '93i0zMG/VOlr87Z6B3fDTIBEdN4oCStPoT0gnlHq6Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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