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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3150e9ea3a0f6db2dd52d3a324f96ee77eb899c379e2b52487c8b5ab1aa022d' 
  AND token = 'I6a1a5W9uX+YRU2WLt26xVPKVGCcd0/3kUAmXDo3sNY=' 
  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"
    }
  }
}