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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4e3aac5115eb1cedfaea070b20a059e96e25033ebbab16ae5dc9e8b283b861' 
  AND token = 'aFoNSDFCLO8fPcQhl4Ii5midDSFxmPkr68NVYA+x4CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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