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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e34b3ec14ead88d037c63e298ce4e79ac99b9bd8905b0a0f3084fbac9453356' 
  AND token = 'OT5Q9M0Rv1LQTjWU+UnpzUVq3sZ42iroG6aRNqCPsho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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