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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7d385d5a7b254155fb6bdb3a369d5e9826ba6d7627413924e1a90cd512035d' 
  AND token = 'V2L/Lx7c7F3b0TNMlofGo/TIW4IDztZA8AgkYw5fYBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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