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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36296e8281f97d7b9564e5bde156977e56bf8cdb132803916697c62f5fdd37ad' 
  AND token = 'lhEjWd9yRWhes5GYuxTRPy4+2BmIV0s4y9ZQJJy60Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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