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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904e7324b365c53d85ae6abcdf3b210ac429ae485a1d41cf69366630e51ec5ff' 
  AND token = 'FRoA5I9pmbHxLph7Z+5KeSdxXfiVG8Qyq6VDDAvawxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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