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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4977b08fc2c1e66978113e232bd45f4abb2ae29d5e4bd745a10db4a523dfa24' 
  AND token = 'nE2mS1KeNJnEoLjnY84r88ZdB5INju1kyE0mv3E5KAc=' 
  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"
    }
  }
}