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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf2f02007d8a39d53913c78bdca73c21c89f0638bd149a237a60bb7471c70f4' 
  AND token = 'N6h7r77TNqhmtPln3+pN5K+AGL447YsSvqI7aq0FsJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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