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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a1b03d9c520f4880c33651b1177223bf9723aa66f0a60cb02bcc637ba4c131' 
  AND token = 'vTnbyYvrojdo3+TL2Mx3c8NC7Y834hsJj/ZSdJoLDBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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