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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff37f1cd7780d4e891eac669ca97fe6e3291b8ede77cf90dd0ab93789c647f08' 
  AND token = 'ffzZ7CCl8yz8lfQcGA5CmGatoqEpI03BPAyfRDfjLtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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