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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d83f14aef9270f731038dda377ce558ed9ba0577420faec4d153a1a0ac553a' 
  AND token = 'p5hn4YwE0UV0b/v+RPzMmoS5Uv7my135vFYNtGxnIxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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