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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5642db932c25b7cebd13caf10e66cd3a8754280f6cb3da83f13d5772efccc1' 
  AND token = 'i6u8uLlBC+58jc5W4myKpQik3h6eSUgnD3/LwwlAMj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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