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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2896cc0820c53c1f4df47e2c2eddf3f03997fc3d8cab975d4a15ab868697470f' 
  AND token = 'TIBhrfD2gJWhEVg8Wk4TY8gK5yquqqrC6g4iR4fMIhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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