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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c464a7d01c2b814b8fa89c477dd8cc28cc1a9795d9adc9e21a4ab5fd245868' 
  AND token = '+gRk8x++GCm5Q2VDa0hSk+wWylLa0C2b8OtDFq0WBek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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