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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546591bcb8cc01989ec94d02bb43599688a1924063a2e212f0cd865cfdf35fc3' 
  AND token = 'tkZ10JCkke+ePf2QYLSwl6EElsUrWVRkJD6zi78V+6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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