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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb4a44015a67bcf50e1a6d106c3e80bd560e72dfa5da10a37daa4cfe2197a58' 
  AND token = '96mjAEADnz3/rbAX/Dbv4N45NkP27A0l4AtQh+FMKX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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