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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b417fbfd470483d2be41310aeda24e0ea154ca64c99ddaf3325ff1b88474f78' 
  AND token = 'T4Bdy6r1XqadhQdGlGqJzvaYXu4/+1kZDtle4cjPlQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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