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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de621bfa721b7e5f079de7a346ffb2f9483ff55cfc3af1306b7c9ad735d4c55d' 
  AND token = 'h9OA08+GRtby/D8U47z2T2rOUC0Srk/z26spDIYO6UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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