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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c68fab62ef8d0f1c8f753ea2e147824769400bdaf605e0ae7b28d03e139de73' 
  AND token = 'ylTCe4ndO2UKyg1QXjmYIx1j2OXg7QaGvC+QlqCPKLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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