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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77178f52c3ed77aa221b1f373ba257cfe23b23cd391219c437c9a6e784f2293c' 
  AND token = 'bjA14PeG4ZNtik6F3HOlYwW6T4wculnIxq8m//JQUho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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