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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ee7acb8a0fbc9a25588b384e7dde3dfd91564cf0a8b78798ce53831be3f039' 
  AND token = 'WbG7vDi2kPsncVvbbBT7bUn5QhjDQmsapcZ1F3SKrmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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