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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91550cd6d85180e2810154db562e87b24d6bc60441fca08127bd700d3f00333a' 
  AND token = 'k6Rk5h4/ndNDLOQV2hBr8apBUUG+cI1W3mMj/Yx8Tnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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