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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3885cc36828e9bcfd0aee80b6bdece57ce25b58cd5188af6fd2054efbfe9f7c' 
  AND token = 'xdrPjLrBOxwUCU1p2hp3rMTnuqianc31e4dzQwG+EGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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