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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e311ca3f8193967fafb2f83ed8df6f1348d8c5486d94affb60fef70260c3be0' 
  AND token = 'UeFeA3kXxwObJ2zWWL6X4EQYdcpjLIu9IK4ZVnm5lPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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