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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068faecab290f9de8dc941bc57c9458eb1e4d40e10882b5d842b0364e65f38b1' 
  AND token = 'sr2lyaKgdVqPWY4ZgdL84rHbcpSnejUsSN9F6xcbsP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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