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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de20640edc641b75c1c3c98677820e38aaff0ff66fc303a0a930f1a2a8bf103' 
  AND token = 'qzh+rXEqzwlf1wc6nnBBUybYXDFw+NVN6gQCMuop6MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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