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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75ab37c97e8ad88f900ddf1e40c8453ae5530e1c39a78a74b4b0d5b8b2d9b68' 
  AND token = '/QSDbfE02bxRFfl3XFG4tC1De8JGQszkA/LB7PU7wvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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