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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e4d60430e2e611eaaf9a3a7a3e77ece1f0b336a9fc0d7835e3a7224f7e5844' 
  AND token = 'OpDNew9C2IUFH4b6FCEcq7z7HVkL5Cd11gKBs39lBTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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