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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f526eecad28178175e6bc4737b6f9fd02874a602962391a0a82f08abb2ca1474' 
  AND token = 'j9T1cSRPL0d6JZCmm1GZO7IV9cIm7Wf5/JFpg41psAU=' 
  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"
    }
  }
}