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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88ad9573544ac3e6695a48324fafb3b5a2b132bd78b137a839f264ada25ccd9' 
  AND token = '85HdXVQlqdeobfF5YO5C+LaW8dibPT+FAX+88Mp39X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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