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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19fc25d91bc67f829779ce71bf2247f616b65e761c5b520a15bc0bdb445f864' 
  AND token = 'tq237m0slccsYwAanJEvQS93+Yf6upMH4A1+Y0Oo1fY=' 
  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"
    }
  }
}