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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5be9ea1f79941c29d3e80127de22fad45406437563593b17f7a1724f01ea71' 
  AND token = 'LVKV8IOwXVXCKlyKL93+KHd3J6uNBj1r1aaICQF+2zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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