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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3574c7ed4359eb9c3d9d7385da1c6d1233aea2a10851f76c7ae632ee267a3b' 
  AND token = 'fTq1M2KfDUW5M1ivCNEVELSYAL98ZQVS1NcfYIwvJLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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