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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909dce2eb713defeb0d2646e249628601fb913c5919cb8fc982fd2a7cf23710f' 
  AND token = 'HkUCV04I5fBwOUIVDsx2GVBL20hUVnfqO8/GRlSBFTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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