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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07e7df15c3afb1872384dfa5c4056bef0884618b1d0d17b91fbaaa4f0ae02c3' 
  AND token = 'mho3AqrIL8m9/OxZfMnv4TSDene64wWtIm8oB4m7QjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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