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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcaa484b18a7bab470ce8c286ce5e6f541a969878c7916115c8293fa145741f' 
  AND token = 'IjCV7yCCQNuB5uavNtLfaI0FAmnFbReMLQDQ/Z+Eu20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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