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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e68ccdffbcd8a234f73ca006c81dd5c64a7e6e45610bb0f21d4acfe70fc4310' 
  AND token = 'uDwQgxGP8QvT8I6paened7p65+KFgATV6Lw5rCfPqnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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