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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663eca070bae50edc4a5ae20e5d6f8177c1a8cca8a7f92cfe7d4616d0529b991' 
  AND token = 'xs5D1cvSVpThCEw9Mmzp9yY8a0J4I1p+UJ2iNyuvFkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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