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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9933fd13a4eae530fa3c3efa8d726fd4aa911e1a8563932f082ac8927798d9c4' 
  AND token = 'iiJKU4+f8bW9THEF39mYpi9O20wFfQC2PCNB1Q0NmEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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