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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0940a6b434b2e7a56a7a61a698518e0e874daa780074bea86d749cba6ff524' 
  AND token = 'Yat36cV6kFF4LRxCmTWCoH0JB1s7eEc9UBunjf78Vhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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