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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345a30d486928a27cb3ae6ac8a03ccbbc0b6849dfd24a5752af964d4a361c019' 
  AND token = 'vNJIEBRovGFzbQMXoa6eRLMtb3lTv6nTNx5ZYvvSzrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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