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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4c9757a0edc3c3683786f399a702496c8b2ad444f33e31b815fc43a93a459a' 
  AND token = '+uPsDIdwAY7M1fMhbq2vtMhlqNie2/B/x4D1/tAZomA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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