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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d8d10c499ab41e8ae4395b93ec95cd032de3fdd6bf57e93e0b36c2e0e58a78' 
  AND token = '/ggm6U8JJSJ8kPWpVAEuEC4t1SUEVecv2gqo7TMR7OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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