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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc656fab4c7d714140f225015c1f7e856d0c2d08fac9dd490f34a0f657f2b0f' 
  AND token = 'opXOV3zZ9qyWzUd6yIE0xOa1VR8TrxHIdj+gNozGDxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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