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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29fc20d489a861e3684d61b0e53a0bdd67eb19bfd1bd89b00c84c367916bbc5' 
  AND token = 'WZ1OnItVG11IavnD61f+KTfdBvM9l6rzom13J0yn/Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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